package com.wl.common.security.utils;

import cn.hutool.core.convert.Convert;
import com.wl.common.core.utils.json.JsonMapperUtil;
import com.wl.common.core.web.dto.RestResultDTO;
import org.apache.commons.lang3.StringUtils;
import org.springframework.util.LinkedCaseInsensitiveMap;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.ServletRequest;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;

/**
 * @author: wanglin
 * @date: 2023-11-06 周一
 * @Version: 1.0
 * @Description:
 */
public class ServletUtils {
    /**
     * 获取String参数
     */
    public static String getParameter(String name) {
        return getRequest().getParameter(name);
    }

    /**
     * 获取String参数
     */
    public static String getParameter(String name, String defaultValue) {
        return Convert.toStr(getRequest().getParameter(name), defaultValue);
    }

    /**
     * 获取Integer参数
     */
    public static Integer getParameterToInt(String name) {
        return Convert.toInt(getRequest().getParameter(name));
    }

    /**
     * 获取Integer参数
     */
    public static Integer getParameterToInt(String name, Integer defaultValue) {
        return Convert.toInt(getRequest().getParameter(name), defaultValue);
    }

    /**
     * 获取Boolean参数
     */
    public static Boolean getParameterToBool(String name) {
        return Convert.toBool(getRequest().getParameter(name));
    }

    /**
     * 获取Boolean参数
     */
    public static Boolean getParameterToBool(String name, Boolean defaultValue) {
        return Convert.toBool(getRequest().getParameter(name), defaultValue);
    }

    /**
     * 获得所有请求参数
     *
     * @param request 请求对象{@link ServletRequest}
     * @return Map
     */
    public static Map<String, String[]> getParams(ServletRequest request) {
        final Map<String, String[]> map = request.getParameterMap();
        return Collections.unmodifiableMap(map);
    }

    /**
     * 获得所有请求参数
     *
     * @param request 请求对象{@link ServletRequest}
     * @return Map
     */
    public static Map<String, String> getParamMap(ServletRequest request) {
        Map<String, String> params = new HashMap<>();
        for (Map.Entry<String, String[]> entry : getParams(request).entrySet()) {
            params.put(entry.getKey(), StringUtils.join(entry.getValue(), ","));
        }
        return params;
    }

    /**
     * 获取request
     */
    public static HttpServletRequest getRequest() {
        try {
            return getRequestAttributes().getRequest();
        } catch (Exception e) {
            return null;
        }
    }

    /**
     * 获取response
     */
    public static HttpServletResponse getResponse() {
        try {
            return getRequestAttributes().getResponse();
        } catch (Exception e) {
            return null;
        }
    }

    /**
     * 获取session
     */
    public static HttpSession getSession() {
        return getRequest().getSession();
    }

    public static ServletRequestAttributes getRequestAttributes() {
        try {
            RequestAttributes attributes = RequestContextHolder.getRequestAttributes();
            return (ServletRequestAttributes) attributes;
        } catch (Exception e) {
            return null;
        }
    }

    public static String getHeader(HttpServletRequest request, String name) {
        String value = request.getHeader(name);
        if (StringUtils.isEmpty(value)) {
            return StringUtils.EMPTY;
        }
        return urlDecode(value);
    }

    public static Map<String, String> getHeaders(HttpServletRequest request) {
        Map<String, String> map = new LinkedCaseInsensitiveMap<>();
        Enumeration<String> enumeration = request.getHeaderNames();
        if (enumeration != null) {
            while (enumeration.hasMoreElements()) {
                String key = enumeration.nextElement();
                String value = request.getHeader(key);
                map.put(key, value);
            }
        }
        return map;
    }

    /**
     * 将字符串渲染到客户端
     *
     * @param response 渲染对象
     * @param string   待渲染的字符串
     */
    public static void renderString(HttpServletResponse response, String string) {
        try {
            response.setStatus(200);
            response.setContentType("application/json");
            response.setCharacterEncoding("utf-8");
            response.getWriter().print(string);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 是否是Ajax异步请求
     *
     * @param request
     */
    public static boolean isAjaxRequest(HttpServletRequest request) {
        String accept = request.getHeader("accept");
        if (accept != null && accept.contains("application/json")) {
            return true;
        }

        String xRequestedWith = request.getHeader("X-Requested-With");
        if (xRequestedWith != null && xRequestedWith.contains("XMLHttpRequest")) {
            return true;
        }

        String uri = request.getRequestURI();
        if (inStringIgnoreCase(uri, ".json", ".xml")) {
            return true;
        }

        String ajax = request.getParameter("__ajax");
        return inStringIgnoreCase(ajax, "json", "xml");
    }

    /**
     * 是否包含字符串
     *
     * @param str  验证字符串
     * @param strs 字符串组
     * @return 包含返回true
     */
    public static boolean inStringIgnoreCase(String str, String... strs) {
        if (str != null && strs != null) {
            for (String s : strs) {
                if (str.equalsIgnoreCase(trim(s))) {
                    return true;
                }
            }
        }
        return false;
    }

    /**
     * 去空格
     */
    public static String trim(String str) {
        return (str == null ? "" : str.trim());
    }

    /**
     * 内容编码
     *
     * @param str 内容
     * @return 编码后的内容
     */
    public static String urlEncode(String str) {
        try {
            return URLEncoder.encode(str, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            return StringUtils.EMPTY;
        }
    }

    /**
     * 内容解码
     *
     * @param str 内容
     * @return 解码后的内容
     */
    public static String urlDecode(String str) {
        try {
            return URLDecoder.decode(str, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            return StringUtils.EMPTY;
        }
    }


    /**
     * security 统一返回信息处理
     *
     * @param response
     * @param code
     * @param msg
     * @throws IOException
     */
    public static void resultSuccessMsg(HttpServletResponse response, Integer code, Object data, String msg) throws IOException {
        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setHeader("Cache-Control", "no-cache");

        response.setCharacterEncoding("UTF-8");
        response.setContentType("application/json; charset=utf-8");
        response.setStatus(code);
        RestResultDTO result = new RestResultDTO<>(code, msg, data, null);
        response.getWriter().write(JsonMapperUtil.toJson(result));
        response.getWriter().flush();
    }

    /**
     * security 统一返回信息处理
     *
     * @param response
     * @param code
     * @param msg
     * @param exceptionMsg
     * @throws IOException
     */
    public static void resultFailMsg(HttpServletResponse response, Integer code, String msg, String exceptionMsg) throws IOException {
        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setHeader("Cache-Control", "no-cache");

        response.setCharacterEncoding("UTF-8");
        response.setContentType("application/json; charset=utf-8");
        response.setStatus(code);
        RestResultDTO result = new RestResultDTO<>(code, msg, null, exceptionMsg);
        response.getWriter().write(JsonMapperUtil.toJson(result));
        response.getWriter().flush();
    }

    /**
     * security 统一返回信息处理
     *
     * @param response
     * @param code
     * @param msg
     * @throws IOException
     */
    public static void resultFailMsg(HttpServletResponse response, Integer code, String msg) throws IOException {
        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setHeader("Cache-Control", "no-cache");

        response.setCharacterEncoding("UTF-8");
        response.setContentType("application/json; charset=utf-8");
        response.setStatus(code);
        RestResultDTO result = new RestResultDTO<>(code, msg, null, null);
        response.getWriter().write(JsonMapperUtil.toJson(result));
        response.getWriter().flush();
    }

    /**
     * security 统一返回信息处理
     *
     * @param response
     * @param msg
     * @throws IOException
     */
    public static void resultFailMsg(HttpServletResponse response, String msg) throws IOException {
        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setHeader("Cache-Control", "no-cache");

        response.setCharacterEncoding("UTF-8");
        response.setContentType("application/json; charset=utf-8");
        RestResultDTO result = new RestResultDTO<>(0, msg, null, null);
        response.getWriter().write(JsonMapperUtil.toJson(result));
        response.getWriter().flush();
    }

    /**
     * 请求路径错误
     *
     * @param response
     * @throws IOException
     */
    public static void resultErrorUri(HttpServletResponse response) throws IOException {
        resultFailMsg(response, HttpServletResponse.SC_BAD_REQUEST, "请求路径错误！", "");
    }

    /**
     * 未登录
     *
     * @param response
     * @throws IOException
     */
    public static void resultNoLogin(HttpServletResponse response) throws IOException {
        resultFailMsg(response, HttpServletResponse.SC_UNAUTHORIZED, "未登录，请登录！", "");
    }

    /**
     * 无效token
     *
     * @param response
     * @throws IOException
     */
    public static void resultInvalid(HttpServletResponse response) throws IOException {
        resultFailMsg(response, HttpServletResponse.SC_UNAUTHORIZED, "无效token，请登录！", "");
    }

    /**
     * 没有访问权限
     *
     * @param response
     * @throws IOException
     */
    public static void resultNotPermission(HttpServletResponse response) throws IOException {
        resultFailMsg(response, HttpServletResponse.SC_FORBIDDEN, "没有操作权限，请联系管理员授权！", "");
    }

}
